Class 564/69 - With ammonia synthesis

Subclass of Class 564 - Organic compounds -- part of the class 532-570 series
Definition: Processes which include the step of synthesizing ammonia.
No. of patents: 46
Last issue date: 12/29/2009

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Number	Title	Issue Date
7638649	Method of preparation of (R)-(−)-5-(2-aminopropyl)-2-methoxybenzenesulfonamide A method of preparation of (R)-(−)-5-(2-aminopropyl)-2-methoxybenzenesulfonamide of formula I and its use for production tamsulosin. A protective group is introduced to N-[(1R)-2(4-methoxyphenyl)-1-methylethyl]-N-[(1R)-1-phenylethyl)]amine and the resulting amide ...	12/29/2009
7220882	Process for urea production and plant In a process for urea production of the type comprising the reaction between ammonia and carbon dioxide in a high-pressure reactor followed by an autothermal stripping of the resulting reaction mixture so as to obtain a gaseous flow comprising ammonia and carbon dio...	05/22/2007
6855846	Process for the preparation of urea Process for the preparation of urea from ammonia and carbon dioxide in which all or part of the liquid ammonia needed for the process is supplied to the high-pressure scrubber in such a way that it is in direct contact with the other streams supplied to this scrubbe...	02/15/2005
6723876	Process for the integrated preparation of ammonia and urea Process for the combined preparation of urea and ammonia reactant by steps of providing ammonia synthesis gas containing carbon dioxide and conversion of the synthesis gas to the ammonia reactant, reacting the ammonia reactant with the carbon dioxide in the synthesi...	04/20/2004
6680407	Installation and process for the preparation of urea The invention relates to an installation for the preparation of urea from ammonia and carbon dioxide, the installation comprising two reactor sections in a vertically placed combined reactor and a high-pressure condenser section. The installation may comp...	01/20/2004
6448441	Gasification process for ammonia/urea production The present invention involves a process for the co-production of ammonia and urea in which two parallel gasifiers are utilized so as to optimize the H2 /CO2 ratio in the combined syngas product, thereby maximizing the ammonia and ur...	09/10/2002
6426434	Process for the synthesis of urea A urea synthesis process with improved heat economy, wherein a urea synthesis solution obtained by removing most of the unreacted ammonium carbamate by stripping with carbon dioxide at a pressure approximately equal to a urea synthesis pressure is subject...	07/30/2002
6392096	Process for the preparation of urea The invention relates to a process for the preparation of urea from ammonia and carbon dioxide, the preparation being effected in whole or in part in a vertical combi-reactor. The gas stream leaving the stripper is fed to the condenser section of a vertic...	05/21/2002
6344588	Process for the preparation of urea In the present process for the preparation of urea, an off-gas stream released during the synthesis of melamine in a high-pressure melamine process which consists predominantly of ammonia and carbon dioxide, is introduced into at least one high-pressure s...	02/05/2002
6342632	Process and plant for the production of urea with high conversion yield and low energy consumption In a process for the production of urea, substantially pure ammonia and carbon dioxide are reacted in a reaction space (1) from which comes out a reaction mixture subjected to stripping (2) to obtain a partially purified mixture sent to a urea recovery se...	01/29/2002
6340451	Method for the simultaneous modernization of a plant for ammonia production and a plant for urea production A method for the simultaneous modernization of a plant for ammonia synthesis and a plant for urea synthesis, provides--inter alia--the arrangement of a carbamate synthesis section and a carbamate decomposition section, in order to obtain a predetermined a...	01/22/2002
6287525	Process and plant for urea production with reaction spaces having differentiated yields In a process for urea production, substantially pure ammonia and carbon dioxide are reacted in a main reaction space from which outgoes a reaction mixture subjected to stripping to obtain a partially purified mixture sent to a urea recovery section. From ...	09/11/2001
6274767	Process for the revamping of urea synthesis plants consisting of a stripper with ammonia Process for the revamping of urea production plants for the synthesis of ammonia (NH3) and carbon dioxide, with a stripping section with NH3, in which the process carries out with differentiated yields, a majority reaction a) between highly pure reagents ...	08/14/2001
6231827	Process for combined production of ammonia and urea A process for the combined production of ammonia and urea of the type comprising an ammonia synthesis reactor (2), a urea synthesis reactor (5) and a urea recovery section (21) stands out for the fact of submitting at least a part of a flow comprising car...	05/15/2001
6118023	Method for increasing the capacity of an existing urea process Method for increasing the capacity of an existing urea process, the existing urea process comprising a reactor (R), a pressure-reduction section (SC) and a urea-recovery section (U), characterized in that (i) a stripping column (S) is added, in which ammonium ...	09/12/2000
6114579	Process for the preparation of urea In the present process for the preparation of urea, an off-gas stream released during the synthesis of melamine in a high-pressure melamine process which consists predominantly of ammonia and carbon dioxide, is introduced into at least one high-pressure s...	09/05/2000
6093850	Process for the synthesis of urea and equipment therefor The present invention provides an improved process for synthesizing urea from ammonia and carbon dioxide while preventing corrosion of sites, that are to be in contact with a condensate, of the joints of a tube plate and cooling tubes in a condenser insta...	07/25/2000
5886222	High yield process for urea synthesis Improved yield process for urea synthesis by starting from ammonia and carbon dioxide, comprising a reaction zone under high pressure and temperature conditions, a section wherein a portion of unreacted ammonia and carbon dioxide are stripped and recycled...	03/23/1999
5849952	Urea production process with high energy efficiency A urea production process with high energy efficiency, in which the urea solution obtained from the synthesis stage is subjected to a first stage of high pressure thermal decomposition of the ammonium carbamate which has not undergone conversion to urea t...	12/15/1998
5847208	Method for increasing the yield and the production potential of urea reactors Urea is formed by the synthesis of ammonia with carbon dioxide at high pressure and temperature in an internal space of reactors through which flow a liquid phase cocurrently with a gas phase. The reactors are divided into compartments to avoid excessive ...	12/08/1998
5792889	Process for urea production involving a carbon dioxide stripping step An improved process for urea production as well as a method of retrofitting a pre-existing urea plant based on the Stamicarbon process are disclosed. According to the invention, a high-yield reactor with partial removal of the reaction heat and a urea rec...	08/11/1998
5763660	High yield process for urea synthesis Improved yield process for urea synthesis by starting from ammonia and carbon dioxide, comprising a reaction zone under high pressure and temperature conditions, a section wherein a portion of unreacted ammonia and carbon dioxide are stripped and recycled...	06/09/1998
5523483	Integrated urea/ammonia process An integrated ammonia/urea process and a plant for carrying out the same. The process comprises recycling a high pressure purge stream made up mostly of air from the urea synthesis cycle to the autothermal reformer in a syngas production unit of the ammon...	06/04/1996
5523482	Process and plant for the production of urea in reaction spaces with different yields In a process of producing urea in which ammonia and carbon dioxide are reacted in a first reaction space (E-1, R-1) the unreacted carbamate present in the reaction mixture is subjected to a thermal decomposition treatment, so as to obtain ammonia and carb...	06/04/1996
5380943	Process and plant for the production of urea with differentiated yield reaction spaces Process for the industrial synthesis of urea, by reacting ammonia (NH3) and carbon dioxide (CO2) in at least one reaction space, at high pressures and temperatures and by recirculating at least part of the non-reacted products obtain...	01/10/1995
5359140	Urea production process of high energy efficiency A urea production process in which the urea solution produced in the reaction zone is treated in sequence with a first thermal decomposer at the same pressure as the reaction, to decompose part of the residual ammonium carbamate into its components, then ...	10/25/1994
5304353	Apparatus for increasing the yield and the production potential of urea reactors Urea is formed by the synthesis of ammonia with carbon dioxide at high pressure and temperature in an internal space of reactors through which flow a liquid phase cocurrently with a gas phase. The reactors are divided into compartments to avoid excessive ...	04/19/1994
5223238	Method for treating ammonia and urea condensates A method is described which enables ammonia plant process condensate contaminated with ammonia, carbon dioxide and methanol and urea plant condensate contaminated with urea, ammonia, carbon dioxide and other combined forms of ammonia and carbon dioxide to...	06/29/1993
5185139	Carbon dioxide production from combustion exhaust gases with nitrogen and argon by-product recovery The present invention is directed to a method for producing carbon dioxide and nitrogen from combustion exhaust gas containing less than about 10% oxygen by weight which comprises the steps of (a) treating the exhaust gas to remove particulate matter, (b)...	02/09/1993
4988491	Flexible integration of the production of ammonia and urea The process of the present invention which produces the flexible integration for the production of ammonia and urea uses adiabatic reforming of the carbonaceous feedstock such as natural gas. With adiabatic reforming of natural gas, a surplus of carbon di...	01/29/1991
4869887	Integrated ammonia-urea process An integrated ammonia urea process where the reaction of carbon dioxide and ammonia is in a urea reactor having a condensing section, a reaction section having more than one stage and a stripping section. The raw ammonia synthesis gas containing carbon di...	09/26/1989
4690812	Integrated production of ammonia and urea The combined production of ammonia and urea by the reaction of gases containing hydrocarbons with steam is conducted by using a steam reformer, downstream secondary reformer, and shift converter. The ammonia synthesis gas (hydrogen, nitrogen and carbon di...	09/01/1987
4652678	Process for the recovery of valuable components from the waste streams obtained in the preparation of urea An improved process for recovering usable components from waste streams containing urea, including a dilute aqueous urea solution, which result from the preparation of particulate urea products. The dilute aqueous urea solution is used to wash a urea cont...	03/24/1987
4552979	Process for treatment of urea plant process condensate A process and apparatus are described which enable urea plant process condensate, which is contaminated with urea and other combined forms of ammonia and carbon dioxide, to be converted substantially completely and on a continuous basis, to a gaseous stre...	11/12/1985
4539077	Process for the preparation of urea An improved process for the preparation of urea from carbon dioxide and excess ammonia at elevated temperature and pressure. The urea solution from the urea synthesis zone is heated and stripped at an elevated pressure to decompose a portion of the ammoni...	09/03/1985
4410503	Process for the removal of urea, ammonia, and carbon dioxide from dilute aqueous solutions An improved process for the removal of urea, ammonia, and carbon dioxide from process condensate derived from coupled urea and ammonia syntheses by hydrolysis of urea and desorption of ammonia and carbon dioxide. Process condensate poor with respect to am...	10/18/1983
4327068	Method and the reuse of sewage waters of the combined urea-ammonia installations A method is disclosed for reusing the processing condensates in a combined plant for the production of ammonia and urea. The condensates are combined into a single stream, filtered to remove the solid substances in suspension, if any, and fed to a boiler ...	04/27/1982
4320103	Flexible integrated method for the production of ammonia and urea In an integrated flexible installation for producing ammonia and urea, the improved method which consists in that a portion of the gaseous stream comprising carbon dioxide, hydrogen and nitrogen is fed to a complementary decarbonation area and then admixe...	03/16/1982
4291006	Combined process for the production of urea and ammonia In an integrated or combined process for the production of ammonia and urea, the improvement consisting in that the absorption of CO2 from the raw gas going to the synthesis reactor for ammonia is carried out with an absorption apparatus which ...	09/22/1981
4197281	Production of ammonia synthesis gas from solid carbonaceous fuels This is a continuous process for producing ammonia synthesis gas and includes the partial oxidation of particles of solid carboniferous fuels entrained in nitrogen. In the process, air is separated into high pressure nitrogen and substantially pure oxygen...	04/08/1980

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Class 564/69 - With ammonia synthesis